Replacement points for excavating bucket teeth



March 20, 1956 c. R. MEEKS REPLACEMENT POINTS FOR EXCAVATING BUCKET TEETH Filed June 6, 1952 Cornelius 1E. mekv BY WZ 'W/DW mm ATTORNEYS REPLACEMENT POINTS FOR EXCAVATING BUCKET TEETH Cornelius R. Meeks, Prescott, Ark. Application Ju ne 6 1952; Serial No. 292,095 1 Claim. c1. 37-142 This invention relates to improvements in teeth for the bucketsbf excavating t equipment, such as drag buckets, front hoe and. back .hoe power shovels, and claim shell buckets, and more particularly to replace: ment points for worn teeth of the character indicated.

It is among the objects of .theinvention to provide a United States Patent'O replacement point which can be securely Welded onto a worn excavating bucket tooth and will restore such tooth to newer better than new condition; which is self sharpening in use and providesa definite lead for thedigging edge of the associated bucket to carry the bucket into the material to be excavated even when the material is hard packed gravel or other composition diflicult to excavatefwhich can be applied to a bucket tooth while the latter is mounted on or removed from an associated bucket, as may be desired; and which is simple and durable in construction, economical to manufacture, easy to i install, and positive and effective in use.

Other objects and advantages' will become apparent from a consideration of the following description and the appended claim in conjunction with the accompanying drawing, in which:

Figure l is a side elevational view of a bucket tooth replacement point illustrative of the invention;

Figure 2 is a top plan view of the replacement point illustrated in Figure l;

Figure 3 is a transverse cross sectional view on the line 3-3 of Figure 1;

Figure 4 is a transverse cross sectional view on the line 4- l of Figure 1; and

Figure 5 is a perspective view of a fragmentary portion of an excavating bucket showing two teeth projecting from the digging edge of the bucket with replacement points at the front ends of the teeth and a weld joint between one point and the associated tooth.

With continued reference to the drawing, the illustrated bucket tooth 10 is a metallic body of elongated, rectangular cross sectional shape somewhat tapered from its rear to its front end and having near its rear end a transverse aperture receiving a rivet 11 by means of which the tooth is attached to the associated bucket 12 at the digging edge of the bucket with its front end disposed forwardly of the adjacent bucket edge. The tooth is recessed on at least one side, to. provide a transverse shoulder 13 bearing against the front edge of the bucket and, in the case of a reversible tooth, is correspondingly recessed at its opposite side to provide a second transverse shoulder 14.

The illustrated replacement point of the present invention is generally indicated at 15 and when the point is applied to a worn bucket tooth 10, the tooth is shortened and the'front end of the remaining portionis double beveled, as indicated at 16 and 17, transversely of the tooth with both of the beveled surfaces disposed at an angle of approximately forty-five degrees to the longitudinal center line of the tooth, the beveled surfaces 16 and 17 providing welding surfaces, as will later appear.

The replacement point 15 comprises a metallic body 20 I of pyramidal shape having a cross sectional base area of 22 and 23 are symmetrically inclined relative to the longitudinal center line of the body 20 and are also convergently inclined from the bottom surface 25 to the top surface 24 of the body 20. The top and bottom surfaces 24 and 25 are asymmetrically inclined, the top surface 24 making a sharper angle with the base plane 21 than the bottom surface 25 and the bottom surface 25 is provided at its wider, rear end with a longitudinal extension 26 which extends somewhat rearwardly of the bottom edge of the base plane 21 and is disposed substantially perpendicular to the base plane. At its rear end the point 20 is double beveled transversely thereof to provide contiguous beveled surfaces 28 and 29 both of which are disposed at an angle of approximately fortyfivc degrees to a plane including the rear edge of the top surface 24 and the rear edge of the bottom surface extension 26. g

The point 15 also includes a second portion 30 which is secured on the top surface 24 of the body or portion 20 and extends forwardly from the apical end of the portion 20 with its longitudinal center line substantially parallel to the longitudinal center line of the portion 20 and substantially in a plane perpendicular to the top and bottom surfaces 24 and 25 of the portion 20 and including the longitudinal center line of this portion. The point portion or body 30 has one part 31 extending rearwardly from the apical end of the portion 29 and of partly cylindrical shape actually constituting the remainder of a cylindrical body disposed as described above with a portion cut away along the plane of the surface of the top surface 24 of the portion 20 of the point, the part 31 being of substantially circular cross sectional shape at the front or apical end of the portion 20 and coming substantially to a point at its rear end with its edges constituting an elongated, narrow hyperbole. The front part 32 of the body portion 30 is of truncated conical shape and extends forwardly from the front or apical end of the tooth portion 20, the front end of the part 32 being cut off in a plane which is rearwardly and upwardly inclined relative to the longitudinal center line of the portion 30 to provide a beveled front end or nose surface, as indicated at 33.

The portion 30 has a maximum diameter which is preferably somewhat less than one-third the maximum width of the portion 20 and the conical part 32 of the portion 30 constitutes, in effect, a pick point which is adapted to easily penetrate the material being excavated and to lead the digging edge 12 of the associated bucket into the material.

In mounting the replacement point on a worn bucket tooth after the front end of the tooth has been double beveled, as described above, the tooth is so positioned that the line of juncture of its beveled surfaces 28 and 29 extends along and is in contact with the line of juncture of the beveled surfaces 16 and 17 of the associated tooth and the sides of the replacement point are substantially flush with the sides of the tooth. Then, with the point held in position in which it constitutes a longitudinal extension of the associated tooth with the longitudinal center line of the point substantially parallel to the longi tudinal center line of the tooth, weld joints, as indicated at 35 and 36, are formed one between the beveled surface 28 of the point and the beveled surface 16 of the tooth and the other between the beveled surface 29 of the point and the beveled surface 17 of the tooth filling the trough-shaped spaces between the beveled front end surfaces of the tooth and the beveled rear end surfaces of the point. These weld joints secure the replacement point firmly in position on the frontend of the associated tooth and restore the worn tooth to am actually better than new condition since the tooth is now provided with the pick point and self-sharpening features of the replacement point.

Because of the tapered form of the forwardly projecting part 32 of the tooth portion 30 and the beveled front end 33 thereof, the wearing away of this element by contact with the excavated material, instead of rounding the point off and rendering it dull, actually maintains the point in a sharp condition until the point is substantially worn away and the inclination of the surfaces of the portion 20 of the replacement point also cause this portion of the point to wear in a manner to maintain the replacement point in a sharp condition while protecting the associated tooth against material wear,

When the replacement points have reached their limit of wear, they may be removed from the associated bucket teeth and new replacement points installed to again restore the bucket teeth to new or better than new condition.

The invention may be embodied in other specific forms without departing'from the spirit or essential characteristics thereof. The present embodiment is, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claim rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claim are, therefore, intended to be'embraced therein.

What is claimed is:

In areplacement point for attachment to an excavating bucket tooth, a pyramidical body having a base end portion and an apical end, said body having an underside adapted to be positioned in a plane in extension of the underside of a bucket tooth and an upper side declining in a direction away from said base end portion to said apical end of said body, said body having opposed sides converging from said base end portion to said apical end of said body, said body having anelongated substantially conical tooth element pr jecting from said declining upper side of said body in a direction away from said base end portion and extending longitudinally beyond said apical end of said body, said tooth element being substantially smaller in cross section than said body and being tapered in a direction away from said body, said base end portion terminating at its end opposite said apical end in a portion arranged to be secured to a bucket tooth said point element having a tapered free end, the opposite end of said point element being laterally spaced from said converging opposed sides of said body and merging into said declining upper side of said body.

References Cited in the file of this patent UNITED STATES PATENTS 716,124 Spangler Dec. 16, 1902 1,573,137 Brannon Feb. 16, 1926 1,840,002 Wallis Ian. 5, 1932 2,148,925 Bochy Feb. 28, 1939 2,285,455 Newell June 9, 1942 2,311,463 Page Feb. 16, 1943 2,369,285 Daniels et al. Feb. 13, 1945 FOREIGN PATENTS 815,122 Germany Sept 27, 1951 

